package com.laosuye.gulimall.product.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.TypeReference;
import com.laosuye.gulimall.product.service.CategoryBrandRelationService;
import com.laosuye.gulimall.product.vo.Catelog2Vo;
import org.redisson.api.RLock;
import org.redisson.api.RedissonClient;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cache.annotation.CacheEvict;
import org.springframework.cache.annotation.Cacheable;
import org.springframework.cache.annotation.Caching;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.laosuye.common.utils.PageUtils;
import com.laosuye.common.utils.Query;

import com.laosuye.gulimall.product.dao.CategoryDao;
import com.laosuye.gulimall.product.entity.CategoryEntity;
import com.laosuye.gulimall.product.service.CategoryService;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.StringUtils;


@Service("categoryService")
public class CategoryServiceImpl extends ServiceImpl<CategoryDao, CategoryEntity> implements CategoryService {

    @Autowired
    CategoryBrandRelationService categoryBrandRelationService;

    @Autowired
    StringRedisTemplate stringRedisTemplate;

    @Autowired
    RedissonClient redisson;

    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        IPage<CategoryEntity> page = this.page(
                new Query<CategoryEntity>().getPage(params),
                new QueryWrapper<CategoryEntity>()
        );

        return new PageUtils(page);
    }

    @Override
    public List<CategoryEntity> listWithTree() {
        List<CategoryEntity> entities = baseMapper.selectList(null);

        List<CategoryEntity> levle1Menus = entities.stream().filter(categoryEntity -> categoryEntity.getParentCid() == 0)
                .map((menu) -> {
                    menu.setChildren(getChildrens(menu, entities));
                    return menu;
                }).sorted((menu1, menu2) -> {
                    return (menu1.getSort() == null ? 0 : menu1.getSort()) - (menu2.getSort() == null ? 0:menu2.getSort());
                }).collect(Collectors.toList());
        return levle1Menus;
    }

    @Override
    public void removeMenuById(List<Long> asList) {
        //TODO 1、检查当前删除的菜单，是否被别的地方占用

        //逻辑删除
        baseMapper.deleteBatchIds(asList);
    }

    @Override
    public Long[] findCatelogPath(Long catelogId) {
        List<Long> paths = new ArrayList<>();
        List<Long> parentPath = findParentPath(catelogId, paths);
        Collections.reverse(parentPath);
        return parentPath.toArray(new Long[0]);
    }

    /**
     * 级联更新所有的数据
     * @param category
     */

    @Caching(evict = {
            @CacheEvict(value = "category",key = "'getLevel1Categorys'"),
            @CacheEvict(value = "category",key = "'getCatalogJson'")
    })
    @Transactional
    @Override
    public void updateCascade(CategoryEntity category) {
        this.updateById(category);
        categoryBrandRelationService.updateCategory(category.getCatId(),category.getName());
    }

    @Cacheable(value = {"category"},key = "#root.method.name")
    @Override
    public List<CategoryEntity> getLevel1Categorys() {
        List<CategoryEntity> categoryEntities = baseMapper.selectList(new QueryWrapper<CategoryEntity>()
                .eq("parent_cid", 0));
        return categoryEntities;
    }

    @Cacheable(value = {"category"},key = "#root.method.name")
    @Override
    public Map<String, List<Catelog2Vo>> getCatalogJson() {
        //查出所有的分类
        List<CategoryEntity> selectList = baseMapper.selectList(null);
        //查出所有1级分类
        List<CategoryEntity> level1Categorys = getParent_cid(selectList,0L);
        //封装数据
        Map<String, List<Catelog2Vo>> parent_id = level1Categorys.stream().collect(Collectors.toMap(k -> k.getCatId().toString(), v -> {
            // 查每一个一级分类下的所有二级分类
            List<CategoryEntity> categoryEntities = getParent_cid(selectList,v.getCatId());
            List<Catelog2Vo> catelog2Vos = null;
            if (categoryEntities != null) {
                catelog2Vos = categoryEntities.stream().map(l2 -> {
                    Catelog2Vo catelog2Vo = new Catelog2Vo(v.getCatId().toString(), null, l2.getCatId().toString(), l2.getName());
                    //给当前二级分类的三级分类封装vo
                    List<CategoryEntity> level3Catelog = getParent_cid(selectList,l2.getCatId());
                    if (level3Catelog!=null){
                        List<Catelog2Vo.Catelog3Vo> collect = level3Catelog.stream().map(l3 -> {
                            Catelog2Vo.Catelog3Vo catelog3Vo = new Catelog2Vo.Catelog3Vo(l2.getCatId().toString(), l3.getCatId().toString(), l3.getName());
                            return catelog3Vo;
                        }).collect(Collectors.toList());
                        catelog2Vo.setCatalog3List(collect);
                    }
                    return catelog2Vo;
                }).collect(Collectors.toList());
            }
            return catelog2Vos;
        }));
        return parent_id;
    }

    /*public Map<String, List<Catelog2Vo>> getCatalogJson2(){
        String catalogJSON = stringRedisTemplate.opsForValue().get("catalogJSON");
        if (StringUtils.isEmpty(catalogJSON)){
            Map<String, List<Catelog2Vo>> catalogJsonFromDb = getCatalogJsonFromDbWithRedissonLock();
            String s = JSON.toJSONString(catalogJsonFromDb);
            stringRedisTemplate.opsForValue().set("catalogJSON",s);
            return catalogJsonFromDb;
        }
        Map<String, List<Catelog2Vo>> result = JSON.parseObject(catalogJSON,new TypeReference<Map<String, List<Catelog2Vo>>>(){});
        return result;
    }

    public Map<String, List<Catelog2Vo>> getCatalogJsonFromDbWithRedissonLock() {
        RLock lock = redisson.getLock("CatalogJson-lock");

        //查出所有的分类
        List<CategoryEntity> selectList = baseMapper.selectList(null);
        //查出所有1级分类
        List<CategoryEntity> level1Categorys = getParent_cid(selectList,0L);

        //封装数据
        Map<String, List<Catelog2Vo>> parent_id = level1Categorys.stream().collect(Collectors.toMap(k -> k.getCatId().toString(), v -> {
            // 查每一个一级分类下的所有二级分类
            List<CategoryEntity> categoryEntities = getParent_cid(selectList,v.getCatId());
            List<Catelog2Vo> catelog2Vos = null;
            if (categoryEntities != null) {
                catelog2Vos = categoryEntities.stream().map(l2 -> {
                    Catelog2Vo catelog2Vo = new Catelog2Vo(v.getCatId().toString(), null, l2.getCatId().toString(), l2.getName());
                    //给当前二级分类的三级分类封装vo
                    List<CategoryEntity> level3Catelog = getParent_cid(selectList,l2.getCatId());
                    if (level3Catelog!=null){
                        List<Catelog2Vo.Catelog3Vo> collect = level3Catelog.stream().map(l3 -> {
                            Catelog2Vo.Catelog3Vo catelog3Vo = new Catelog2Vo.Catelog3Vo(l2.getCatId().toString(), l3.getCatId().toString(), l3.getName());
                            return catelog3Vo;
                        }).collect(Collectors.toList());
                        catelog2Vo.setCatalog3List(collect);
                    }
                    return catelog2Vo;
                }).collect(Collectors.toList());
            }

            return catelog2Vos;
        }));
        return parent_id;
    }*/

    private List<CategoryEntity> getParent_cid(List<CategoryEntity> selectList,Long parent_cid) {
        //return baseMapper.selectList(new QueryWrapper<CategoryEntity>().eq("parent_cid", v.getCatId()));
        List<CategoryEntity> collect = selectList.stream().filter(item -> item.getParentCid() == parent_cid).collect(Collectors.toList());
        return collect;
    }

    private List<Long> findParentPath(Long catelogId,List<Long> paths){
        paths.add(catelogId);
        CategoryEntity byId = this.getById(catelogId);
        if (byId.getParentCid() != 0) {
            findParentPath(byId.getParentCid(),paths);
        }
        return paths;
    }

    //递归查找所有子菜单
    private List<CategoryEntity> getChildrens(CategoryEntity root, List<CategoryEntity> all) {
        List<CategoryEntity> children = all.stream().filter(categoryEntity -> {
            return categoryEntity.getParentCid() == root.getCatId();
        }).map(categoryEntity -> {
            //找到子菜单
            categoryEntity.setChildren(getChildrens(categoryEntity,all));
            return categoryEntity;
        }).sorted((menu1,menu2)->{
            return (menu1.getSort() == null ? 0 : menu1.getSort()) - (menu2.getSort() == null ? 0:menu2.getSort());
        }).collect(Collectors.toList());
        return children;
    }

}
